EP0923098B1 - Device and method for applying a metallic contact member to a support by welding - Google Patents

Description

The invention relates to a mounting device for attaching small parts according to claim 1.

Such a device is known, for example, from DE 24 54 804 C3 and the corresponding US-A 4 048 461.

In this known device, the contact metal blanks are introduced in a direction of approach of the electrodes approximately orthogonal insertion plane into a receptacle of the movable electrode and then with the movable electrode along the Schweißbewegungslinie approximated to the support member and clamped together with the support member between the two electrodes. The contact metal blank to be processed in each case is in this known device of the recording of the movable electrode added when he begins the movement in the direction of the support member. He is not secured in the electrode. In the known device is therefore bound to arrange the movable electrode so that when approaching the movable electrode to the support member of the respective contact metal blank is held by gravity in the receptacle of the movable electrode.

The known device has also been further developed to the effect that the recording of the contact metal blank in the one electrode was assigned a suction nozzle, so that after receiving the respective contact metal blank in the recording of the electrode in question a backup of the contact metal blank could be ensured in this recording by negative pressure. It has been found that, although the whereabouts of the contact metal blank could be secured within the recording of the respective electrode by such a suction nozzle regardless of the position of the electrodes in space, but in the subsequent welding by the existence of the suction nozzle to the finished molded metal part contact an imprint originated, which the exact, desired Form of the contact metal part has falsified and was the cause of faulty behavior of the contact metal part during operation and for premature wear of the contact metal part in operation. This problem occurred in particular when the contact metal parts were attached to electrical switching contacts of the microelectronics, where it depends on the exact shape of the contact metal part in order to ensure a reliable current transition over the contact metal part during operation of the respective component and to ensure a long service life of the respective component ,

Also from DE-AS 22 50 461 a device for attaching contact metal blanks to support parts by welding is known. There, the contact metal blanks are cut from a wire or strip material, already at a location outside the respective welding gap. The cut contact metal blanks are then advanced by advancing the leading end of the wire or ribbon forming the contact metal blanks in a guide until they enter the weld gap. However, the guide guiding the singulated contact metal blanks can only extend to a point shortly before, but in any case outside, the welding gap, so that this guide can not interfere with the subsequent welding either mechanically or electrically. This means that even in this known embodiment, the contact metal blanks rest unsecured on the respective electrode and therefore may be subject to local displacements when the electrodes approach. Also in this embodiment, the position of the electrodes in space and the direction of their approach movement is not arbitrary.

From GB-PS 562 018 a device for welding balls to a pipe piece is known. Here ferromagnetic balls are processed. The balls are brought by introducing means in a welding preparation position opposite to one of the electrodes and are held in the region of this one electrode by magnetic holding means in welding preparation position. If the magnetic retaining means have become effective, the introduction means, which have previously brought the ball in the welding preparation position, can be withdrawn, wherein the respective ball then maintains its position relative to the electrode. Subsequently, the second electrode can then be aligned with the first electrode and approximated to the first electrode. This known device requires a very complicated mechanism and is basically only usable when ferromagnetic welding metal blanks are processed.

In the document "DE-A-20 41 453" a mounting device for attaching small parts according to the preamble of claim 1 is disclosed. There is also disclosed a method of mounting a hardware.

It is therefore an object of the present invention to enable a mounting of small parts on a small parts carrier, in which the small parts supply for transporting a small part to the installation site with greater structural freedom can be arranged than is the case in the prior art.

This object is achieved by a mounting device having all the features of claim 1 and a method having all the features of claim 37.

In an embodiment of a mounting device according to the invention, the introduction means comprise at least one blank holder which is movable along the introduction plane into a blank dispensing position and which is designed to hold in its blank dispensing position the respective contact metal blank in its welding preparation position within the welding gap. The control means are designed such that after introduction of the contact metal blank into the welding preparation position, a relative approaching movement of the welding electrodes along the welding movement line until joint clamping of the carrier part and the contact metal blank between the first and the second welding electrode, then the blank holder is removed from the blank dispensing position and then the welding current transition is initiated.

To ensure that the blank holder in its blank dispensing position within the space between the support member and the first electrode finds space, ie the gap which after the occurrence of clamping its height approximately equal to the height of the respective contact metal blank, is preferably ensured that the blank holder in the direction of the welding movement line has an extension which is less than the height of the contact metal blank in this direction. Of course, this requirement must be met only for those areas of the blank holder, which even enter the welding gap.

In other words, it can also be said that the blank holder must be formed so that it detects the contact metal blank in a space disc, which lies in the direction of the Schweißbewegungslinie between a carrier surface facing the contact surface and one of the first welding electrode facing contact surface of the Kontaktmetallrohlings.

The blank holder may be formed so that the contact metal blank is immovably held in its welding preparation position in the introduction level. This is to say, in other words, that the blank holder in the weld preparation position of the contact metal blank suppresses any unintentional movement of the contact metal blank parallel to the introduction plane. On the other hand it is possible and u.U. even advantageous that the blank holder allows the contact metal blank in the welding preparation position compensating movements orthogonal to the introduction level. In that case, the contact metal blank can in fact approach itself when approaching the welding electrodes to the respective end position of the welding electrodes in which the clamping occurs.

The blank holder can in principle be designed as a clamping holder, for example in a pliers or fork shape or hairpin shape. Although with the use of such a clamping blank holder, the secure positioning of the contact metal blank usually readily is guaranteed, it should not be ruled out in principle that the blank holder is carried out with suction means to ensure additional security of positioning. These suction means can be carried out here easily with a suction nozzle. Namely, this suction nozzle can not give rise to an unintentional impression deformation of the contact metal blank, because the blank holder is no longer present at the welding location during the welding process, but has previously been withdrawn. An embodiment of the blank holder with magnetic means should not be excluded in principle in the event that ferromagnetic contact metal blanks are processed.

The course of movement of the blank holder in the introduction level is largely variable. However, the blank holder is preferably associated with blank holder guide and drive means which cause the blank holder to perform a reciprocating blank inserting and welding gap dis- placement movement in the insertion plane. The blank insertion movement then brings the contact metal blanks into their weld preparation position. By the welding gap displacement movement, the blank holder can be withdrawn without hindrance by now clamped between the contact carrier and electrode contact metal blank in a position in which the blank holder obstructs neither further electrode approach during the welding process still causes the risk of electrical short circuit or shunt. The blank holder guide and drive means may be configured such that the blank holder performs substantially linear blank insertion and sealing gap dislocations in the region of the welding electrodes within the insertion plane, for example linear movements along a linear guide path indicative of the blank dispensing position. However, it does not depend on a strict linearity of these movements; It is conceivable, for example, that the blank holder moves along a curved path into the blank dispensing position and in turn moves back along a curved path from the blank dispensing position before the actual welding process begins.

After the respective Schweißspaltdistanzierungsbewegung, ie the movement by which the blank holder is withdrawn from the welding gap before the actual welding process, you will usually want to load the blank holder again with a contact metal blank, then to make a subsequent weld can. It is therefore further proposed that the blank holder guide and drive means are adapted to each cause a transitional movement of the blank holder between a Schweißspaltdistanzierungsbewegung and a subsequent Rohlingseinbringungsbewegung, in the course of the blank holder passes into a blank receiving position, where it cooperates with Rigsingsbeschickungsmitteln.

According to a preferred embodiment of the device according to the invention it is provided that the Rohlingshalterführungs- and -antriebsmittel a longitudinally along a carriage track movable carriage, on which at least one blank holder carrying a pivot arm is pivotally mounted, wherein in a blanking position near movement range of the carriage Swivel arm on the carriage fixed together with the carriage performs the Rohlingseinbringungs- and welding gap distance movement and executes in a subsequent movement of this range of movement of the pivot arm of the carriage movement superimposed pivotal movement. In this embodiment of the device, it is possible to bring the blank holder after retreating from the welding gap in a relatively remote from the welding gap blank receiving position and thereby also umzuorientieren, so that even under confined space conditions, the loading of the blank holder with a new contact metal blank is easily possible. In particular, it becomes possible to redirect the blank holder within the introduction plane with respect to its blank dispensing position during the transition to the blank receiving position by 180 °. Such reversal by 130 ° allows to introduce the blanks substantially parallel to the movement in the blank holder, in which the blanks are brought later to the welding preparation position. In this way, a total space-saving compact structure of the device can be obtained. Such a compact construction is particularly desirable when the welding device is to be housed within a superordinate machine within which the carrier part and / or the contact metal part is subjected to further deformation or assembly operations. For the same reason, it can be advantageous if the swivel arm is fixed on the carriage in a movement range of the carriage near the blank feed means and executes a reciprocating linear movement in the direction of the feed means or away from the feed means. In this further refinement, all essential movements of the contact metal blank are then moved into approximately one line of movement, which leads to a further increase in compactness.

Constructively, the pivoting movement of the pivot arm on a carriage can be achieved in that the pivot arm is caused to pivot by means of a rack and pinion drive. To do this, one only needs to carry out the pivoting arm with a pinion which engages on a part of the carriage movement with the rack and thus initiates the pivoting movement. Outside the meshing area of the rack, the pivot arm then performs a common linear motion with the carriage, which serves the blank insertion and nip at one end of the carriage movement and, if desired, at the other end of the carriage movement to approach the blank holder can lead to the blank feed means and after loading of the blank holder for the withdrawal of the blank holder from the blank feed means.

According to a preferred embodiment, the carriage is provided with a single pivoting arm, which relative to the carriage performs a reciprocating pitch circle, in particular semicircular movement, which lies in the insertion plane on one side of the carriage track. The advantage of this embodiment is that swings in the pitch circle movement of the swivel arm only to one side of the carriage track. On the other side, on which the swivel arm does not deflect, the device can then directly adjoin a neighboring subassembly of a higher-level machine without the possibility of movement collisions. For example, it is possible to arrange two welding devices of the adjacent type in the immediate vicinity, in such a way that the pivot arms of the two welding devices deflect in opposite directions.

Basically, however, an embodiment conceivable such that on the carriage in a star or cross-shaped arrangement, a plurality of each carrying a blank holder pivot arms is rotatably mounted, each arm after a welding gap distance movement in several, the number of pivot arms corresponding angular steps a full circle in the Passage level before he performs another Rohlingseinbringungsbewegung. In this embodiment, the movement sequence is preferably such that an angular step takes place in each case when the carriage is removed from the welding gap. The incremental rotation of the star or cross-shaped arrangement can be effected, for example, by a shift-pawl drive which operates each time the carriage moves away from the electrode assembly. The design according to the invention of the introduction means is in principle not bound to a specific design of the blank feeding or blank feeding means to the blank holder. It is advantageous, however, if the introduction means are driven in timed relation to the blank feeding means, through which the at least one blank holder is fed with contact metal blanks.

In view of the above-pointed out aspect of the compact and slim design of the device according to the invention, it is also advantageous if the Rohlingsbeschickungsmittel for feeding the at least one blank holder comprise a feed line, which in approximately rectilinear flight to a blank insertion and Schweißspaltdistanzierungsbewegung the at least one blank holder lies.

The blank feed means may be implemented with a step-by-step advancing device for a strand material and a periodic severing device separating the individual contact metal blanks from the respective leading end of the strand material. In such an embodiment, the supply of the strand material will preferably be in alignment with the direction of movement in view of the compact construction and simple material flow, in which the blank holder brings the separated contact metal blanks to the welding preparation position and then withdraws from the weld gap region. This aligned arrangement of the reciprocating movement of the blank holder in the electrode region on the one hand and the strand material supply on the other hand is easily made possible that the blank holder undergoes a reorientation by 180 ° in its transition from the blank dispensing position into the blank receiving position.

In principle, it is also possible that the blank feed means a storage container for contact metal blanks and means for removing and Orienting individual contact metal blanks from this storage vessel include. Also in this embodiment, one can lay the exit path from the storage vessel substantially to the path that performs the blank holder in the approach to and distancing from the blank dispensing position.

The requirement for a compact design can be satisfactorily met when the welding electrode assembly, a linear guide track for the blank insertion and Schweißspaltdistanzierungsbewegung the blank holder and a feed line for feeding the blank holder with contact metal blanks are arranged approximately in a common main plane of a machine block of the device , which main plane is arranged orthogonal to the introduction plane. It can then additionally provide that the envelope surfaces of the machine block are arranged substantially parallel to this common main plane.

The carrier parts can basically be brought by hand to the welding site. However, the device according to the invention will preferably be used in the context of higher-level machines in which the carrier parts equipped with the contact metal parts are subjected to further machining operations or assembly operations. As a rule, such higher-level machines should also work automatically with regard to the carrier part feed, so that it is recommended to also provide a feed device for carrier parts or for a strand material for forming carrier parts in the machine block of the device according to the invention. The feed direction for the carrier parts or the strand material forming these will then preferably extend substantially orthogonal to the main plane of the machine block.

In practice, the contact metal blanks are often attached to support parts which are punched out of wide strips. The can Occasionally, contact metal attachment locations on these wide bands are attached near the opposite longitudinal edges of the bands. This means that a large space in the direction transverse to the Bandeinlaßrichtung is required for the implementation of these bands by the device according to the invention, comparable to the large space requirement, which consists of a sewing machine, if you want to edit there sewing wide panels. In the device according to the invention this leads to the fact that one must provide a wide feedthrough slot parallel to the introduction plane, calculated from the welding gap, feedthrough slot which extends from the welding gap in the direction of the feed means for the contact metal blanks. This wide feedthrough slot for the carrier tape material can be easily provided when the moving parts of the insertion means for inserting the contact metal blanks are housed within the machine block on one side of a boundary plane defined by a contact metal blanks receiving surface of the support member and parallel to the insertion plane on the side of this boundary plane on which the contact metal blanks are located when mounted on the support member. It is then readily possible for the machine block forming the welding device to have a strip which provides at least partially overlapping receiving or feed-through slots for the support parts or carrier parts, with the moving parts of the introduction means.

The drive for the welding electrodes is often derived from the drive of a higher-level machine, such as a stamping, bending or assembly machine. For this purpose, a first drive ram can be provided for the movement of the welding electrodes. The actuation of the introduction means can then also be derived from the drive of the parent machine. In principle, it would also be possible to derive the actuation of the introduction means from the first drive plunger which effects the relative movement of the welding electrodes. But to the To simplify construction of the device according to the invention and to promote its compact design, it is advisable to provide a second drive plunger for the actuation of the introduction means. Both drive tappets can then be driven, for example, by a respective cam, these cams can sit on a common camshaft of the parent machine. The second drive plunger is preferably placed between the first drive plunger and the electrode arrangement with a view to the simplest possible flow of movement within the device according to the invention. The feed means for feeding the at least one blank holder can then be actuated by the first or the second drive tappet. For activating the feed means, it is preferred to use the first drive tappet which also effects the relative movement of the electrodes, as shown in DE 24 54 804 C3 and corresponding US Pat. No. 4,048,461.

The drive tappets are in turn arranged with respect to the simplest possible flow of movement within the device according to the invention substantially orthogonal to the introduction plane. The two drive tappets may be arranged approximately in a main plane orthogonal to the introduction plane of a machine block comprising the electrode arrangement, the introduction means and the feed means.

The movable welding electrode of the electrode arrangement can be arranged, for example, on a pivoting body, which is pivotably mounted about a pivot axis parallel to the introduction plane, as is also shown and described in DE 24 54 804 C3 and the corresponding US patent.

The basic concept of the invention is not only applicable to welding equipment; It can also be used in other assembly operations be where small parts are to be attached to support parts. Accordingly, the invention also relates to a mounting device for attaching small parts to a small parts carrier, in which at a mounting location, the respective small parts are mounted on the support parts. Analogous to the design of a welding device according to the invention then applies to this mounting device that a small parts transport holder is movably arranged between a small parts receiving position and a small parts dispensing position in a mounting location touching the mounting location, which temporarily holds in its Kleinteilabgabeposition the respective small part in a Montagevorbereitungsposition in the field of installation that are provided at the mounting location essentially mounting Geordgebundene support means and that control means are provided which cause after the introduction of the respective small part in the Montagevorbereitungsposition the holder of the small part of the montageortgebenden support means, the KleinteilTransporthalter is removed therefrom from the installation site and carried out the assembly thereto becomes. If desired, this mounting device can also be configured with all the introduction means and / or small-part loading means and / or their positioning, guiding and control components which have been described above in connection with the special embodiment of the welding device.

If this is the case of other small parts, as an example of such small parts rivets and other fasteners mentioned, which must be attached to a support member to hold, for example, any additional parts to the respective support member in a fixed position.

According to a further aspect, the invention relates to a method for attaching a contact metal blank to a support member by welding, wherein a contact part mounting position of the support member between welding electrodes is introduced, the along a Schweißbewegungslinie relative are then moved to a contact metal part resulting, already isolated contact metal blank in a Schweißvorbereitungsposition between the support member and a first welding electrode, then a relative approach between the first welding electrode and the support member, then the support member and the contact metal blank together between the first and a second welding electrode are placed under contact pressure and then a welding current transition between the two welding electrodes is introduced, which flows over at least one contact point between the contact metal blank and the support member. It is essential that the introduction of the contact metal blank takes place in the welding preparation position along a substantially orthogonal to the Schweißbewegungslinie introduction level. In this method, in view of the above-mentioned technical problem, the procedure is such that the introduction of the contact metal blank into the welding preparation position is effected by a blank holder movable along the insertion plane into a blank dispensing position such that the blank held by the blank holder in the blank dispensing position thereof is in the welding preparation position Contact metal blank is clamped by an approach movement of the welding electrodes along the welding movement line, that then the blank holder is removed from the blank dispensing position and that only then the welding operation is initiated.

Also, the procedural aspect of the invention may be generalized beyond the application of welding. Accordingly, the invention further relates to a method for mounting a small part to a support member in such a way that the respective small part is brought in a mounting location touching insertion level by means of a small parts transport holder in a mounting preparation position, the holder of the small part at the mounting preparation site is then taken over by mounting bracket bound mounting means and the assembly is then completed. If desired, in In connection with the feeding and mounting of the small parts, those feeding and charging measures which have been mentioned above in the case of a welding operation are used.

• Fig. 1 eine Draufsicht auf ein Trägerteil mit mehreren darauf mittels der erfindungsgemäßen Einrichtung befestigten Kontaktmetallteilen;
• Fig. 2 eine erfindungsgemäße Einrichtung teilweise im Schnitt;
• Fig. 3 eine vergrößerte Darstellung eines Details bei III der Fig. 2;
• Fig. 4 eine Ansicht gemäß IV der Fig. 3;
• Fig. 5 einen Ablaufplan der erfindungsgemäßen Einrichtung;
• Fig. 6 eine schematische Darstellung eines Bearbeitungszentrums mit mehreren erfindungsgemäßen Einrichtungen;
• Fig. 7 eine weitere Ausführungsform einer erfindungsgemäßen Übergabeeinrichtung; und
• Fig. 8 eine andere Ausführungsform der Elektroden.

The accompanying figures illustrate the invention with reference to embodiments. They show:

• 1 shows a plan view of a carrier part with a plurality of contact metal parts fastened thereto by means of the device according to the invention;
• Fig. 2 shows a device according to the invention partly in section;
• Fig. 3 is an enlarged view of a detail in III of Fig. 2;
• Fig. 4 is a view according to IV of Fig. 3;
• Fig. 5 is a flow chart of the device according to the invention;
• Fig. 6 is a schematic representation of a machining center with a plurality of devices according to the invention;
• 7 shows a further embodiment of a transfer device according to the invention; and
• Fig. 8 shows another embodiment of the electrodes.

FIG. 1 shows a plan view of a carrier sub-strand 10 with a plurality of contact metal parts 14 'fastened thereto by means of a welding device 12 according to the invention. The term "carrier strand" indicates that it can be separated into individual carrier parts, which are marked in Fig. 1 with 10-1 to 10-3.

According to FIG. 2, contact metal blanks 14 are fed to the welding device 12 in the form of a contact metal strand 16. The contact metal strand 16 comes from a strand supply and is transported by a still to be described in detail strand feed device 18 to a shearing device 20. In the shearing apparatus 20, the contact metal blanks 14 are sheared from the contact metal strand 16 and supplied to a transfer device 22 which feeds the individual contact metal blanks 14 to a welding electrode assembly 24 to weld the singulated contact metal blanks 14 to the support sub-strand 10 by welding, as described previously, and to contact metal parts 14 'transform.

The welding electrode assembly 24 includes two welding electrodes 26 and 28 which define a welding gap 30 and are movable along a welding trajectory 32 while changing the gap width of the welding gap 30 relative to each other. The upper welding electrode 26 is formed as a movable welding electrode, whereas the lower welding electrode 28 is a stationary welding electrode. The lower welding electrode 28 is part of a base frame 34 of the welding device 12. On the base frame 34 is pivotally mounted in the plane of electrode support 36 of the upper welding electrode 26, so that the upper welding electrode 26 in a small angular range of pivotal movement of the electrode carrier 36 has a nearly vertical Exercise movement. The pivot axis S of the pivotable electrode carrier 36 is in the welding device 12 according to FIG. 2 in reality right outside of FIG. 2 and is only indicated schematically. The two welding electrodes 26 and 28 are connected to a welding power source.

In order to keep the carrier strand 10 or the individual carrier parts 10-1 to 10-3 between the welding electrodes 26 and 28 in a defined position, the welding device 12 is provided with a holding device for the Carrier strand 10 provided. This holding device can be designed as a feed device with an orthogonal to the plane extending feed direction.

The welding electrode arrangement 24 is preceded by the transfer device 22, which receives the contact metal blanks 14 separated by the shearing device 20 and transfers them into the region of the welding gap 30 in the introduction plane TP. The essential components of the transfer device 22 are in Fig. 2 within the schematically indicated block 38, which contains the essential, the handover exporting components of Rohlingshalterführungs- and -antriebsmittel 38, which are shown in Figs. 3 and 4 in detail. The relationship between the shearing device 20 and the Rohlingshalterführungs- - 38 and drive means shown in FIG. 2 is shown in that in this Fig. 3 of the block 38 immediately preceding nozzle head 40 of a shearing slide 42 of the shearing device 20 is shown. The transfer device 22 includes according to FIGS. 3 and 4 as part of Rohlingshalterführungs- and -antriebsmittel 38 shown in FIG. 2, a transfer carriage 44 which is guided in a stationary frame member 46 on both sides guide rails 48. The frame part 46 is fastened to the base frame 34 via bolts 50. On the underside of the transfer carriage 44, a Schwenkarmnabe 52 is provided which has a part-circular toothed segment 54 at one end. Through the center of this toothed segment 54 is a bearing pin 60 through which the Schwenkarmnabe 52 is pivotally mounted on the transfer carriage 44. At the bottom of Schwenkarmnabe 52, a pivot arm 58 is attached.

As can be seen in Figs. 3 and 4, the pivot arm 58 is fork-shaped with adjacent in the insertion plane TP clamping legs 60, by a clamping receptacle 62 is limited. The clamp receiver 62 has two end positions. In the end position E according to FIG. 4, which is a blank receiving position, the clamping receptacle is located 62 in abutment with the nozzle head 40 of the shearing slide 42, as shown in Fig. 3.

In this case, the contact metal blank 14 which has just been grasped by the clamping receptacle 62 is stabilized in the vertical direction in that the clamping receptacle 62 lies in a slot 64 of a slot body 66.

In the blank receiving position E of the clamping receptacle 62 shown in FIG. 3, the feed of the terminal receptacle 62 with a contact metal blank 14. For the charging process, the nozzle head 40 has moved so far down with the Abscherdüse 68 that - in the example, two - Kontaktmetallrohlinge 14, the straight lie within the shear nozzle 68 of the nozzle head 40, aligned with the slot 64 and with the clamp receptacle 62. Then the contact metal blank 14 lying further to the left within the shearing nozzle 68 can be pushed into the clamping receptacle 62 by pushing the contact metal strand 16 further.

The clamping receptacle 62 with the contact metal blank 14 just taken up by it must now be transferred to the end position A, which is a blank dispensing position A, within the welding gap 30 between the two electrodes 26 and 28. The transfer process is as follows:

First, as shown in FIG. 4, the clamp receiver 62 linearly moves from the blank receiving position E to an intermediate position D. Then, the clamp receiver 62 moves along an arcuate path via an intermediate position C to an intermediate position B. Finally, the clamp receiver 62 moves from the intermediate position B to the intermediate position Blank Dispensing Position A. The movements of the clamp receiver 62 from E to D and from B to A are along a linear guide track 39 in alignment with the feed path of the contact metal strand 16.

3, the contact metal blank 14 is in its weld preparation position 15. Now, the welding electrode 26 approaches the stationary welding electrode 28 until the contact metal blank 14 is clamped on the support member 10. In this case, the contact metal blank 14 can move if necessary in the clamping receptacle 62. Following this, the unloaded clamp receiver 62 can travel back along the path A-B-C-D to the blank receiving position E without losing the positioning of the contact metal blank 14 in the welding preparation position 15.

On the return path section from blank dispensing position A to position B, the clamp receiver 62 disengages from the contact metal blank 14 clamped in the welding preparation position 15, and the clamp receiver 62 is spaced from the welding gap 30 and the contact metal blank 14 located in the welding preparation position 15; this distance is sufficient to avoid a mechanical or electrical disturbance of the subsequent welding process. When the clamp receiver 62 reaches position B, the welding current between the two electrodes 26 and 28 can be turned on. The contact metal blank 14 is then at least partially melted and the electrode 26 can accordingly be downwardly adjusted. The welding current flows, at least at the beginning of the current transition, over contact lugs 70 of the contact metal blank 14, so that the melting begins at defined locations (see FIG. 1). In place of the contact warts 70, other "welding aids" may occur, e.g. Welding bars, corrugations or other characteristics. However, it is also conceivable to make the weld-on contact on the underside smooth, in particular if it is provided with a solder layer on this underside.

When the welding of the contact metal blank 14 to the carrier sub-strand 10 is completed, the electrode 26 can be raised again and the carrier sub-strand 10 can be moved in the direction orthogonal to the plane of the drawing of Fig. 3 by one step, so that a next-following placement place 13 on the carrier sub-strand 10 enters the welding gap 30. When the next loading station 13 of the carrier sub-string 10 has entered the welding gap 30, the clamping receiver 62 has traveled the return path to the blank receiving position E where it detects the next contact metal blank 14 and transfers it from the blank receiving position E to the blank dispensing position A, as described above. Of course, the clamp receiver 62 can also reach the blank dispensing position A with a time shift compared to the entry of the next loading station 13 into the welding gap 30.

• daß alle bisher beschriebenen und im folgenden noch zu beschreibenden Bewegungsabläufe derart aufeinander abgestimmt werden, daß pro Zeiteinheit eine möglichst große Zahl von Schweißvorgängen stattfinden können. Wenn die Schweißeinrichtung 12 an einer Stanz- und Biegemaschine zur Herstellung von elektrischen oder elektronischen Komponenten angebaut ist, so sollen mindestens 300, vorzugsweise mindestens 500 solche Komponenten pro Minute hergestellt werden und dementsprechend viele Schweißvorgänge muß die Schweißeinrichtung 12 pro Zeiteinheit leisten. Dies ist nur deshalb möglich, weil die Kontaktmetallrohlinge 14 auf ihrem ganzen Weg zwischen der Abtrennung vom Kontaktmetallstrang 16 bis zum Eintritt in die Schweißvorbereitungsposition 15 und auch danach noch bis zur Beendigung des Schweißvorgangs gegen unbeabsichtigte Bewegung gesichert sind.

As a principle:

• that all previously described and to be described in the following movements are coordinated so that each time unit, the largest possible number of welding operations can take place. If the welding device 12 is mounted on a punching and bending machine for the production of electrical or electronic components, so should at least 300, preferably at least 500 such components per minute are produced and accordingly many welding operations must afford the welder 12 per unit time. This is possible only because the contact metal blanks 14 are secured against inadvertent movement along their entire path between separation from the contact metal strand 16 until entry into the weld preparation position 15 and also thereafter until completion of the welding operation.

To carry out the movements described above, the toothed segment 54 of the Schwenkarmnabe 52 cooperates with a rack 72; this is based on Fig. 4 for the transition of the terminal receiving 62 described from the blank dispensing position A to the blank receiving position E:

For the transition from the blank dispensing position A to the position B of the transfer carriage 44 moves from its left end position A of FIG. 4 to the right, without a tooth engagement takes place. When the clamp receiver 62 reaches position B, the sector gear 54 engages the gear section 78. As the transfer carriage 44 then advances further to the right, the pivot arm hub 52 pivots with the pivot arm 58 through position C to position D. The arc path of FIG Clamping receptacle 62 is defined by superposition of the linear movement of the transfer carriage 44 and the pivoting movement of the pivoting arm 58 about the bearing pin 60. When the position D is reached, the engagement between the toothed segment 54 and the toothed portion 78 is released again, so that upon further movement of the transfer carriage 44 to the right, the clamping receptacle 62 undergoes a linear movement from position D to the blank receiving position E. During the movement of the clamping receptacle 62 between the blank dispensing position A and the position B and between the position D and the blank receiving position E, the pivot arm 58 is secured against pivoting, for example, that of the rack 72 each next tooth of the toothed segment 54 on sliding surfaces 74 and 76th slides, which are provided on both sides of the toothing region 78 on the rack 72.

The reciprocating movement of the transfer carriage 44 is derived from a cam or cam 80, which acts on a drive lever 84 via a plunger 82. The drive lever 84 is mounted in the stationary frame part 46 and engages in a driving joint 86 of the transfer carriage 44. The plunger 82 is held in constant engagement with the cam 80 by a helical compression spring 88.

The transfer device 22 is synchronized with the shearing device 20 and the strand feed device 18 for the contact metal strand 1 6, so that, as already mentioned, then a contact metal blank 14 is inserted from the nozzle head 40 of the shearing slide 42 into the clamping receptacle 62 when the clamping receptacle 62 at the nozzle head 40 abuts and is in alignment with the shearing nozzle 68. The shearing of a contact metal blank 14 takes place in each case in that the Abscherdüse 68 of the Abscherschiebers 42 is moved relative to a stationary guide channel 90 for the Kontaktmetallstrang 16 upwards in the position shown in FIG. 2 and 3, after the leading end of the Kontaktmetallstrangs 16 during ejection of a Kontaktmetallrohlings fourteenth is advanced from the Abscherdüse 68 in the clamping receptacle 62 by the length of a contact metal blank 14 in the Abscherdüse 68.

1. 1. Der Strangvorschubschlitten 94 fährt in Fig. 2 von rechts nach links; die Mitnahmeklemmeinrichtung 92 klemmt dabei den Kontaktmetallstrang 16; die Halteklemmeinrichtung 96 ist gelöst; der Kontaktmetallstrang 16 wird nach links vorgeschoben.
2. 2. Wenn der Strangvorschubschlitten 94 seine linke Endposition in Fig. 2 erreicht hat, wird zuerst die Halteklemmeinrichtung 96 geklemmt und dann die Mitnahmeklemmeinrichtung 92 gelöst.
3. 3. Hierauf fährt der Strangvorschubschlitten 94 zurück in die rechte Endposition; dabei ist der Kontaktmetallstrang 16 durch die Halteklemmeinrichtung 96 festgehalten und die gelöste Mitnahmeklemmeinrichtung 92 fährt mit dem Strangvorschubschlitten 94 längs des festgehaltenen Kontaktmetallstrangs 16 zurück.
4. 4. Nach Rückkehr des Strangvorschubschlittens 94 in die rechte Endposition wird die Mitnahmeklemmeinrichtung 92 wieder geklemmt und die Halteklemmeinrichtung 96 anschließend wieder gelöst.
5. 5. Nunmehr kann der nächste Vorschubschritt gemäß Ziff. 1 beginnen.

The strand feed device 18 comprises a driving clamp 92 on a strand feed carriage 94 and a holding clamp 96 on a frame part 98. The clamping movements of these clamping devices are timed with the movement of the strand feed carriage 94 as follows:

1. 1. The strand feed carriage 94 moves in Fig. 2 from right to left; the driving clamp 92 clamps the contact metal strand 16; the holding clamp 96 is released; the contact metal strand 16 is advanced to the left.
2. 2. When the strand feed carriage 94 has reached its left end position in Fig. 2, first the holding clamp 96 is clamped and then the driving clamp 92 is released.
3. 3. Thereafter, the strand feed carriage 94 moves back to the right end position; In this case, the contact metal strand 16 is held by the holding clamp 96 and the dissolved driving clamp 92 travels with the strand feed carriage 94 along the retained contact metal strand 16.
4. 4. After return of the strand feed carriage 94 in the right end position, the driving clamp 92 is clamped again and then the holding clamp 96 is released again.
5. 5. Now, the next feed step in accordance with para. 1 start.

• Auf- und Abbewegung des beweglichen Elektrodenträgers 36;
• Auf- und Abbewegung des Abscherschiebers 42;
• Vorschubbewegung des Strangvorschubschlittens 94;
• Klemmung und Lösung der Klemmeinrichtungen 92 und 96.

A plunger 102 acted upon by a cam 100 controls the following operations:

• Up and down movement of the movable electrode carrier 36;
• Up and down movement of the shearer slide 42;
• Feed movement of the strand feed carriage 94;
• Clamping and loosening the clamping devices 92 and 96.

The up and down movement of the movable electrode carrier 36 by the spring 105 upwardly biased plunger 102 takes place against the action of a helical compression spring 104 supported on a plate nut 106 of the plunger 102 helical compression spring 108, which via a pressure ring 110 on the movable electrode carrier 36th acts. The up and down movement of the Abscherschiebers 42 takes place from the plunger 102 via an intermediate lever 112 against the action of a helical compression spring 114th

The movement of the strand feed carriage 94 and the clamping and release of the clamping devices 92 and 96 takes place from the plunger 102 via a multi-armed lever 116.

A cam plate 118 of the multi-arm lever 116 acts via a control pin 120 on a balance lever 122, which the clamping and Lösebewegungen the two clamping devices, ie the driving clamp 92 and the retaining clip 96, triggers in the timing described above.

A lever arm 124 of the multi-armed lever 116 engages with play in a catch pocket 126 of the strand feed carriage 94. This game is responsible for the fact that in the state shown in FIG. 2, the advancing movement of the strand feed carriage 94 can only begin after a Anfangsverschwenkung the mehrarmigen lever 116 in the clockwise direction over the cam plate 118 the control pin 120 and the balance lever 122 clamped the clamping device 92 and then the holding clamp 96th has solved.

• in Zeile 1 des Diagramms
  p1b die Stößelbewegung des Stößels 102;
• in Zeile 2 des Diagramms
  s1b die Schlittenbewegung des Strangvorschubschlittens 94;
• in Zeile 3 des Diagramms
  zeb die Klemmbackenbewegung der Mitnahmeklemmeinrichtung 92;
• in Zeile 4 des Diagramms
  zhb die Klemmbackenbewegung der Halteklemmeinrichtung 96;
• in Zeile 5 des Diagramms
  amb die Abscherdüsenbewegung der beweglichen Abscherdüse 68;
• in Zeile 6 des Diagramms
  oeb die Elektrodenbewegung der oberen Schweißelektrode 26;
• in Zeile 7 des Diagramms
  p2b die Stößelbewegung des Stößels 82;
• in Zeile 8 des Diagramms
  s2b die Schlittenbewegung des Übergabeschlittens 44; und
• in Zeile 9 des Diagramms
  tzb die Bewegungskomponente der Klemmaufnahme 62 in Richtung der linearen Führungsbahn 39.

FIG. 5 shows various functions during a work cycle. Along the abscissa axis, the time course during a work cycle is shown. This time course is represented by a rotation angle of the cams 80 and 100. In the individual lines 1 to 9, the movements of various parts of the welding device 12 are represented by curves. In each point of these curves, their distance above the respectively associated base line represents a location coordinate of the respective part in the course of its functional movement. These movements are symbolized in FIGS. 2, 3 and 4 by movement arrows. Where:

• in line 1 of the diagram
  p1b the plunger movement of the plunger 102;
• in line 2 of the diagram
  S1b, the carriage movement of the strand feed carriage 94;
• in line 3 of the diagram
  zeb the jaw movement of the driving clamp 92;
• in line 4 of the diagram
  zhb the jaw movement of the retaining clip 96;
• in line 5 of the diagram
  amb the shearing nozzle movement of the movable shearing nozzle 68;
• in line 6 of the diagram
  above the electrode movement of the upper welding electrode 26;
• in line 7 of the diagram
  p2b the plunger movement of the plunger 82;
• in line 8 of the diagram
  s2b is the carriage movement of the transfer carriage 44; and
• in line 9 of the diagram
  tzb the movement component of the clamping receptacle 62 in the direction of the linear guide track 39th

The abscissa value 0 ° in FIG. 5 corresponds to the state shown in FIG. 2. In this state is
according to line 1 of the plunger 102 at the bottom;
according to line 2 of the strand feed carriage 94 on the far right;
according to line 3, the driving clamp 92 not yet clamped;
according to line 4, the retaining clip 96 still clamped;
according to line 5, the shear 68 still at the top;
according to line 6, the movable welding electrode 26 still in the lowermost position, which corresponds to the completion of the welding operation;
according to line 7 of the plunger 82 in a middle position of its downward path;
according to line 8 of the transfer carriage 44 on its way to the right in a position shortly before the engagement between the toothed segment 54 and the toothing region 78; and
according to line 9, the clamping receptacle 62 approximately in the position B of FIG. 4th

As already mentioned, the swivel arm 58 with the clamp receptacle 62 performs a reciprocating pitch circle, in particular a semicircle movement B-C-D, D-C-B, relative to the transfer carriage 44, which lies on one side of the linear guide track 39 in the insertion plane TP. The pivot arm 58 occurs depending on the length more or less far beyond a lateral boundary surface 49 of the welding device 12 on one side; Therefore, in the arrangement of two welding devices 12 and 12 'side by side, which is schematically indicated in Figure 4 by showing a second welding device 12' and a second transfer device 22 ', the transfer devices 22 and 22' interpreted as (mirror image arrangement of the transfer devices 22 and 22nd ') that the individual pivot arms 58 and 58' swing out in opposite directions and can not touch.

The transfer device 22 is designed such that the Rohlingshalterführungs- and -antriebsmittel 38 are arranged only on one side, namely in Fig. 2 upwardly facing side of a boundary plane LF, which defines by a contact metal blanks 14 receiving surface of the carrier sub-strand 10 and is parallel to the introduction level TP. On the other side, namely the side of the delimiting plane LF pointing downwards in FIG. 2, there is a receiving slot RS which extends parallel to the delimiting plane LF and to the introduction plane TP in the direction of the shearing device 20. In the receiving slot RS, for example, a carrier sub-strand 10 can be inserted, so as to allow the attachment of contact metal blanks 14 at the welding device remote edge region of the carrier sub-strand 10 (Fig. 1).

The slot 64 of the slot body 66 shown in FIG. 3 receives the clamping receptacle 62 of the pivot arm 58 on the transfer device 22. The height of the slot 64 corresponds approximately to the height of a contact metal blank 14 and serves to prevent a vertical deflection of the contact metal blank 14 from the linear guide track 39 during the insertion of the contact metal blank 14 into the clamping receptacle 62.

In Fig. 6, a punching and bending machine 128 is shown, are welded in the contact metal blanks on a carrier sub-strand 10 of FIG. 1, from which individual carrier parts 10-1, 10-2 and 10-3 are produced, for example, electrical components be subjected to punching or bending operations before or after welding. The parts obtained in this way can be integrated within the punching and bending machine with e.g. Insulating parts are connected, which then speaks of assembly machine.

In the assembly machine shown in Fig. 6 is a machine, as shown and described for example in DE 33 19 380 in all details.

The carrier sub-string 10 is fed to the assembly machine 128 by means of an intermittent tape feed 130. In two successively provided welding devices 12 and 12 'contact metal blanks 14 at the top of the carrier strand 10, as shown for example in Fig. 1, attached. Subsequently, the carrier sub-strand 10 is fed to a punching device 132 in which the carrier sub-strand 10 is trimmed, for example, to form a series of still-connected carrier parts 10-1 - 10-3. Following the punching device 132 is followed by another welding device 12 "which welds contact metal blanks 14 onto the underside of the carrier parts 10-1 - 10 - 3. Subsequently, bending, punching, punching and tapping stations 134 are run through which terminate the carrier parts A subsequent, not shown Separator finally separates the individual finished carrier parts of the carrier sub-strand 10 and separated them. The welding devices 12, 12 'and 12 "are mounted as preassembled units on a tooling plate 136 of the assembly machine 128 and can be attached or detached as needed. The contact metal strand 16 for forming the individual contact metal blanks 14 in the respective welding devices 12, 12' and 12" is supplied through the tool plate 136 from the back of the mounting machine 128 forth.

As can be seen in Fig. 6, the pivot arms on the lateral boundary surfaces 49 and 49 'of the two adjacent welding device 12 and 12' on one side with the adjacent transfer devices (as seen in Fig. 4) are arranged so that the pivot arms after swing out in opposite directions, which is illustrated in Fig. 6 by arrows 138 and 139, and can not touch. Therefore, the welding devices 12 and 12 'can abut each other in the sense of optimum space utilization.

In Fig. 7, there is shown an embodiment modified with respect to the feeder and the transfer device, the illustration being limited to the essential parts. In this figure, analogous parts to parts of Figs. 1 - 4 by analogous reference numerals, each augmented by the number a, respectively.

According to Fig. 7, a total of four pivot arms 58a-1 - 58a-4 are mounted on the pivot hub 52a; the pivot hub 52a is in this embodiment, in each case advanced by 90 °, always in the same direction. In the figure, the clamp receiver 62a-2 of the swing arm 58a-2 of the feeder 140a just receives a contact metal blank 14a. Subsequently, the hub 52a moves by means of a carriage corresponding to the transfer carriage 44 of Fig. 3 in the direction of the linear guide track 142a, so that the clamp receiver 62a-4 of Swing arm 58a-4 enters the blank dispensing position A in the region of the welding gap 30a. Here, the contact metal blank 14a is clamped by the clamp receiver 62a-4 by welding electrodes, not shown. Once the contact metal blank 14a is clamped between the welding electrodes, the pivot hub 52a is moved back toward the linear guideway 142a. During this return movement, the pivot hub 52a rotates by 90 ° clockwise, so that after completion of the backward movement and this rotational movement, the clamping receptacle 62a-1 of the pivot arm 58a-1 enters the blank receiving position E and receives there a blank 14a.

The rotation of the pivot hub 52a in the course of each backward movement of the pivot hub 52a to the right is accomplished by a pawl mechanism. Each time one of the clamp receivers 62a-1 - 62a-4 is in the blank receiving position E, a contact metal blank 14a is pushed by a push-in pin 144a into the respective clamp receiver. The contact metal blanks 14a are fed from a blank container 146a via a blank channel 148a. The promotion in the blank channel 148a can be done pneumatically, for example. The blanks 14a come in this way to rest against the tip of the plunger 144a and can be pushed by the latter into the respective clamping receptacle 62a-1 - 62a-4.

With each forward movement of the pivoting hub 52a to the left (without rotation of the pivoting hub 52a), a contact metal blank 14a is brought into the welding preparation position 15a. With each fall of the pivot hub 52a to the right (with rotation of the pivot hub 52a), one of the clamp receivers is brought into the blank receiving position E and loaded with a blank 14a. Each contact metal blank 14a introduced into the blank receiving position E into a specific blank clamping receptacle arrives after every two pivoting movements by 90 ° in each case into the welding preparation position 15a.

In the welding device according to the invention monitoring elements, such as micro-switches, proximity sensors or even image monitoring devices may be provided to ensure a smooth flow of the welding device.

To form the welding electrode (position 26 of Fig. 2) is nachzutragen still that there the welding electrode is formed as a wheel electrode which can be rotated about a horizontal or vertical axis and thus used sequentially in a plurality of positions. For this purpose, the welding electrode may be formed, for example, as a polygonal electrode wheel which has nests at angular intervals for receiving the respective blank. In such a wheel-shaped electrode design eccentric loads may result, leading to uneven contact pressure in the contact surface. Uneven contact pressure can lead to a deterioration of the welding quality when large contact surfaces occur.

It is therefore further proposed, in particular for the case of large contact surfaces, that the contact metal blank is welded onto the carrier part by pin electrodes, wherein in the case of pin electrodes of the contact metal blank with the centroid of its contact surface is centered on the axis of the pins 2. In this way results in a uniform contact pressure in the entire contact surface. In Fig. 8 such a solution is shown. One recognizes there a carrier tape 10, which runs perpendicular to the drawing plane of FIG. 8 and is to be welded to contact metal blanks 14. The upper and lower electrode carriers 36 and 34, which have already been described in more detail with reference to FIG. 2, can be seen further. In each of the electrode carriers 36 and 34, a clamping receptacle 36a or 34a is received for a pin electrode 26p or 28p. The formation of the clamp receptacle 34a is shown on the lower electrode carrier 34. Adjoining the clamp receptacle 34a to the right and left to a clamping slot 34b, of clamping screws 34c is penetrated, so that the clamp receptacle 34a can be relaxed or narrowed. After wear of an electrode surface of the respective electrode pin can be post-processed and nachgeschoben. The current flow through the pin electrodes is denoted by cf.

By using the pin electrodes shown in FIG. 8, in addition to equalizing the welding pressure, it is also ensured that the welding current, thanks to the geometric arrangement of the welding surfaces to the welding electrodes, thanks to the aligned arrangement of the cylindrical welding electrodes and thanks to the approximately centric arrangement of the welding electrodes in the electrode carriers has uniform current density over the entire contact surfaces. The contact is, so to speak, in the range of the largest current density.

Welding between planar end surfaces of pin electrodes is of particular interest in connection with the feeding device according to the invention. The feeding device, which holds the contact metal blanks until they are clamped between the electrodes, makes it possible to dispense with special nests in the electrodes. In addition, the insertion device according to the invention allows to position the contact metal blanks at any point of the welding electrode end faces and thus to take into account the demand for the most uniform current flow density.

Claims (38)

1. Assembly device for attaching small parts (14) onto a small part carrier (10), in which the respective small parts (14) are mounted onto carrier parts (10) at an assembly point (30), wherein the assembly device comprises:

   - a small part transport holder (62), which is arranged moveably in a fixing plane (TP) contacting the assembly point (30) between a small part mounting position (E), in which it cooperates with small part fitting means (18, 20) of the assembly device for mounting a small part (14), and a small part delivery position (A), in which it temporarily holds the respective small part (14) in an assembly preparation position (15) in the region of the assembly point (30),

   - guiding and driving means (38) which drive the small part transport holder (62) into the fixing plane (TP) and guide it during the movement,

   - assembly point-connected holding means (26, 28) provided at the assembly point, and

   - control means, which effect the holding of the small part (14) by the assembly point-connected holding means (26, 28) after it is put in the assembly preparation position (15),

   - after which the small part transport holder (62) is removed from the assembly point (30) and assembly is then carried out,

   characterised in that
   the guiding and driving means (38) drive and guide the small part transport holder (62) in the fixing plane (TP) by way of a linear assembly point distancing movement, by guiding the small part transport holder (62) out of the small part delivery position (A), leaving the small part (14) in its assembly preparation position (15), to an intermediate position (B), to a following transition movement (B-C-D-E-D-C-B) guiding it from the intermediate position (B) to the small part mounting position (E) and back, which consists of a linear movement and a superimposed pivoting movement, and to a following linear small part insertion movement (B-A) leading from the intermediate position (B) to the small part delivery position (A).
2. Assembly device according to claim 1, characterised in that it consists of a device for fixing a contact metal blank (14) as the small part onto a carrier part (10) by welding, said device (12) comprising:

   - a welding electrode arrangement (24) with at least two welding electrodes (26, 28), which define a welding gap (30) as an assembly point (30) and are moveable relative to one another along a welding movement line (32) by changing the gap width of the welding gap (30),

   - holding means for holding the carrier part (10) in a position in which a contact part-assembly point (13) of the carrier part (10) lies within the welding gap (30),

   - at least one blank holder (62) as the small part transport holder (62), which is moveable in a fixing plane (TP), that is essentially orthogonal relative to the welding movement line (32), between a blank mounting position (E), in which the blank holder (62) cooperates with blank fitting means (18, 20) for mounting a blank (14), and a blank delivery position (A), in which the blank holder (62) holds the respective contact metal blank (14) in a welding preparation position (15) between the carrier part (10) and a first welding electrode (26),

   - blank holder guiding and driving means (38), which drive and guide the blank holder (62) for movement in the fixing plane (TP) allocated to the blank holder (62),

   - driving means (100) for moving the first welding electrode (26) in the direction of the welding movement line (32) towards the second (28) welding electrode,

   - an electric welding current supply for introducing a welding current junction between the two welding electrodes (26, 28) via at least one contact point (70) between the contact metal blank (14) and the carrier part (10), and
   control means for controlling the driving means (100) and the welding current supply, in order to bring the first welding electrode (26) to the contact metal blank (14) after inserting a contact metal blank (14) into the welding preparation position (15), after which contact pressure is generated between the contact metal blank (14) and the carrier part (10) and then a current junction is formed between the welding electrodes (26, 28) via at least one contact point (70) between the contact metal blank (14) and the carrier part (10),
   whereby the blank holder guiding and driving means (38) drive the blank holder (62) in the fixing plane (TP) to a linear welding gap distancing movement (A-B) guiding the latter out of the blank delivery position (A) by leaving the blank (14) in its welding preparation position (15) to an intermediate position (B), to a following transition movement (B-C-D-E-D-C-B) guiding from the intermediate position (B) to the blank mounting position (E) and back, which comprises a linear movement and a superimposed pivoting movement, and to a linear blank placing movement (B-A) following this leading from the intermediate position (B) close to the weld to the blank delivery position (A).
3. Assembly device according to claim 2, characterised in that the blank holder (62) has an extension in the direction of the welding movement line (32) which is smaller than the height of the contact metal blank (14) in this direction.
4. Assembly device according to claim 2 or 3, characterised in that the blank holder (62) is mounted in its blank delivery position (A) in the intermediate space between the carrier part (10) and the first electrode (26) according to the height of the contact metal blank (14).
5. Assembly device according to one of claims 2-4, characterised in that the blank holder (62) is designed to take up the contact metal blank (14) inside a space disc, which lies in the direction of the welding movement line (32) between a contact surface facing the carrier part (10) and a contact surface of the contact metal blank (14) facing the first welding electrode (26).
6. Assembly device according to one of claims 2-5, characterised in that the blank holder (62) is designed to secure the contact metal blank (14) non-displaceably in its welding preparation position (15) in the fixing plane (TP).
7. Assembly device according to one of claims 2-6, characterised in that the blank holder (62) is designed so that the contact metal blank (14) in the welding preparation position (15) can perform compensating movements orthogonally to the fixing plane (TP) inside the blank holder (62).
8. Assembly device according to one of claims 2-7, characterised in that the blank holder (62) is designed as a clamping holder.
9. Assembly device according to claim 8, characterised in that the clamping holder (62) is designed as a fork-shaped clamping holder with clamping arms (60) lying adjacent to one another in the fixing plane (TP).
10. Assembly device according to one of claims 2-9, characterised in that the blank holder is designed to have suction means.
11. Assembly device according to one of claims 2-10, characterised in that the blank holder is designed to have magnetic means.
12. Assembly device according to one of claims 2-11, characterised in that blank holder guiding and driving means (38) are allocated to the blank holder (62) which cause the blank holder (62) to perform a back and forth blank insertion and welding gap distancing movement (B-A-B) in the fixing plane (TP)
13. Assembly device according to claim 12, characterised in that the blank holder guiding and driving means (38) cause linear blank insertion and welding gap distancing movements (B-A-B) of the blank holder (62) along a linear guideway (39) pointing towards the blank delivery position (A).
14. Assembly device according to claim 12 or 13, characterised in that the blank holder guiding and driving means (38) between a welding gap distancing movement (A-B) and a following blank insertion movement (B-A) of the blank holder (62) cause a transition movement (B-C-D-E-D-C-B) of the blank holder (62), in the course of which the blank holder (62) reaches a blank holding position (E) in which it cooperates with the blank fitting means (18, 20).
15. Assembly device according to claim 14, characterised in that the blank holder guiding and driving means (38) comprise a slide (44) moving back and forth along a slideway (48), on which at least one pivot arm (58) bearing a blank holder (62) is pivotably mounted, whereby in a movement area of the slide (44) close to the blank delivery position (A) the pivot arm (58) on the slide (44) together with the slide (44) performs the blank insertion and welding gap distancing movement (B-A-B) and in a movement area (B-C-D; D-C-B) following the former movement the pivot arm (58) performs a pivot movement superimposed over the slide movement.
16. Assembly device according to one of claims 12-15, characterised in that the blank holder guiding and driving means (38) also cause the blank holder (62) to perform a back and forth blank take up and collecting movement (D-E-D), in particular such that the pivot arm (58) even in a movement of the slide (44) close to the blank fitting means (18, 20) is fixed onto the latter and performs a back and forth linear movement (D-E-D) in the direction of the fitting means (18, 20) or away from the fitting means (18, 20).
17. Assembly device according to one of claims 15 and 16, characterised in that the pivot arm (58) can be pivoted by a rack-and-pinion drive (54, 78).
18. Assembly device according to one of claims 15-17, characterised in that a single pivot arm (58) is provided which performs a back and forth part circular, in particular semi-circular movement (B-C-D;D-C-B) relative to the slide (44), which lies in the fixing plane (TP) on one side of the linear guideway (39).
19. Assembly device according to one of claims 15 and 16, characterised in that on the slide in a star or cross-shaped arrangement a number of pivot arms (58a) are attached rotatably each carrying a blank holder (62a), whereby each pivot arm (58a) after a welding gap distancing movement in several angular steps according to the number of pivot arms (58a) moves through a full circle relative to the slide in the insertion plane, before it performs a further blank insertion movement.
20. Assembly device according to claim 19, characterised in that and angular step occurs with the removal of the slide from the welding gap (30a).
21. Assembly device according to claim 20, characterised in that stepwise rotational movement is performed by a ratchet drive.
22. Assembly device according to one of claims 2-21, characterised in that the insertion means (22) are driven in synchronization with the blank fitting means (18, 20), by means of which the at least one blank holder (62) is fitted with contact metal blanks (14).
23. Assembly device according to one of claims 2-22, characterised in that the blank fitting means (18, 20) comprises a fitting line (90) for fitting the at least one blank holder (62) which is almost flush in a straight line with the blank insertion and welding gap distancing movement (B-A-B) of the at least one blank holder (62).
24. Assembly device according to one of claims 2-23, characterised in that it is fitted with blank fitting means (18, 20), which comprise a stepwise operating advancing device (18) for an extrusion material (16) and a periodically operating separating device (20) for separating contact metal blanks (14) from the respective advance end of the extrusion material (16).
25. Assembly device according to one of claims 2-23, characterised in that it is designed to have blank fitting means (140a) which comprise a supply vessel (146a) for contact metal blanks (14a) and means for removing and orienting individual contact metal blanks (14a) from the supply vessel (146a).
26. Assembly device according to one of claims 2-25, characterised in that the welding electrode arrangement (24), a linear guideway (39) for the blank insertion and welding gap distancing movement (B-A-B) of the blank holder (62) and a fitting line (90) for fitting the blank holder (62) with contact metal blanks (14) are arranged almost in a common main plane (MP) of a machine block of the device, said main plane (MP) being orthogonal to the fixing plane (TP).
27. Assembly device according to claim 26, characterised in that the machine block comprises a feeding device (130) for carrier parts (10-1-10-3) or for an extrusion material (10) for the formation of carrier parts (10) with a carrier part feeding direction which is essentially orthogonal to the main plane (MP).
28. Assembly device according to one of claims 2-27, characterised in that the moved parts of the fixing means (22) for fixing the contact metal blanks (14) inside a machine block are accommodated on one side of a delimitation plane (LF), which is defined by a surface of the carrier part (10) mounting the contact metal blanks (14) and is parallel to the fixing plane (TP), on the side of the delimitation plane (LF) on which the contact metal blanks (14) are located during their attachment to the carrier part (10).
29. Assembly device according to claim 28, characterised in that the machine block comprises a mounting slot (RS) for carrier parts (10) which overlaps the fixing means (22) at least partly.
30. Assembly device according to one of claims 2-29, characterised in that in addition to a first drive ram (102) for the relative movement of the welding electrodes (26, 28) it comprises a second drive ram (82) essentially parallel to the first drive ram (102) for the activation of the fixing means (22).
31. Assembly device according to claim 30, characterised in that the second drive ram (82) is arranged between the first drive ram (102) and the electrode arrangement (24).
32. Assembly device according to claim 30 or 31, characterised in that the drive rams (82, 102) are arranged to be essentially orthogonal to the fixing plane (TP).
33. Assembly device according to one of claims 30-32, characterised in that by means of the first drive ram (102) fitting means (18, 20) can also be activated to equip the at least one blank holder (62).
34. Assembly device according to one of claims 30-32, characterised in that the two drive rams (82, 102) are arranged in a main plane (MP) of a machine block comprising the electrode arrangement (24), the fixing means (22) and the fitting means (18, 20) almost orthogonal to the fixing plane (TP).
35. Assembly device according to one of claims 30-32, characterised in that a moveable welding electrode (26) of the electrode arrangement (24) is attached to a pivot body (36) which can be pivoted about a pivot axis (S) parallel to the fixing plane (TP).
36. Assembly device according to one of claims 30-35, characterised in that the driving rams (82, 102) can be driven by different cams (80, 100) revolving in the machine cycle of a superordinate machine (128).
37. Method for assembling a small part (14) on a carrier part (10), in which the respective small part (14) is mounted in a small part mounting position (E) by means of a small part transport holder (62) which is arranged moveably in a fixing plane (TP) contacting an assembly point (30) and brought into an intermediate position (B) by means of a supply movement (E-D-C-B) which comprises a linear movement and a superimposed pivot movement, after this it is brought by a linear small part fixing movement (B-A) into an assembly preparation position (15), the small part (14) is then held by assembly point connected holding means (26, 28), after this the small part transport holder (62) is moved by leaving the small part (14) in the assembly preparation position (15) by a linear assembly distancing movement (A-B) into the intermediate position (B) and then by a return movement (B-C-D-E), which comprises a linear movement and a superimposed pivot movement, into the small part mounting position (E), whereby the assembly is brought to an end after the small part (14) is taken over by the assembly point connected holding means (26, 28).
38. Method according to claim 37, characterised in that it is a method for attaching a contact metal blank (14) onto a carrier part (10) by welding,
    whereby a contact part fitting place (13) of the carrier part is inserted between welding electrodes (26, 28) which can be moved relative to one another along a welding movement line (32),
    after this an already supplied contact metal blank (14) forming the contact metal part (14) is inserted by a blank holder (62) moveable in a fixing plane (TP) essentially orthogonal to the welding movement line (32) between a blank mounting position (E) and blank delivery position (A) by means of a blank fixing movement (B-A) into a welding preparation position (15) between the carrier part (10) and a first welding electrode (26),
    after this by means of an approaching movement of the welding electrodes (26, 28) along the welding movement line (32) there is a relative approach between the first welding electrode (26) and the carrier part (10),
    after this the carrier part (10) and the contact metal blank (14) held by the blank holder (62) in its blank delivery position (A) in the welding preparation position (15) are put under contact pressure together between the first (26) and a second welding electrode (28),
    after this the blank holder (62) is removed from the blank delivery position (A) by a welding gap distancing movement (A-B) and
    after this a welding current junction is introduced between the two welding electrodes (26, 28) which flows via at least one contact point (70) between the contact metal blank (14) and the carrier part (10) and thus a welding process takes place,
    whereby the blank holder (62) performs the return movement (B-C-D-E) between a welding gap distancing movement (A-B) and a blank fixing movement (B-A) through which it reaches the blank mounting position (E), in which it takes a blank (14) from the blank fitting means (18, 20) and them performs the return movement (E-D-C-B) to an intermediate position (B) which is the end point (B) of the welding gap distancing movement (B-A), start or end point (B) of the return (B-C-D-E) or the supply movement (E-D-C-B) and start point (B) of the blank insertion movement (B-A).

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